Shibaura SX21 - Timing Gear Case･･･････････････････････････････････････････････････････････････････････････78

ENGINE SYSTEMS
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10) Flywheel and ring gear
Inspection
Check the ring gear and replace if damage or
remarkable wear is noticed.
When the wear is limited to a small area, remove the,
ring gear, turn it about 90 degrees and shrinkage-fit to
reuse it. To shrinkage-fit the ring gear, heat it to 120 –
150°C to allow it to expand.
11) Cam shaft ass’y
Inspection
(1) Check the journal and cam for wear and damage and
replace if the service limit is exceeded.
(2) Correct insignificant uneven wear or scars on the
cam surface using oil stone or the like.
A. Height of intake/exhaust valve cams (mm)
Standard assembling
value
Service limit
26.565 – 26.62 Less than 26.2
B. Height of injection pump cams (mm)
Standard assembling
value
Service limit
33.94 – 34.06 Less than 33.8
12) Timing gear
Inspection
(1) If pitting or remarkable wear is observed on the
tooth face of gears, replace the gear.
(2) Measure the backlash of gears and replace if the
service limit is exceeded.
Timing gear backlash (mm)
Standard assembling
value
Service limit
0.08 More than 0.25
37
38
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